feat(core): consolidate auth service into backend and implement stripe billing

This commit performs a major architectural refactor by migrating the standalone `auth-service` into the main `backend` application, enabling a unified codebase and simplified deployment. It also introduces comprehensive Stripe billing support and a new administrative dashboard.

Key changes:
- **Architecture**: Deleted `apps/auth-service` and integrated its functionality (JWT, magic links, OAuth, user management) into `apps/backend`.
- **Billing**: Added Stripe integration to `backend`, supporting both monthly and yearly subscription cycles with automatic plan entitlement enforcement (e.g., location limits).
- **Admin Dashboard**: Implemented a new administrative service and API endpoints to manage tenants, users, and view platform-wide statistics.
- **Frontend**:
    - Added a new pricing page with monthly/yearly toggle and comparison table.
    - Integrated Stripe and Sentry for payments and error tracking.
    - Improved dashboard UX/UI and added i18n support for new features.
    - Enhanced the public booking flow with better validation and contact form integration.
- **Database**: Added migrations for users, magic links, password resets, OAuth states, admin audit logs, and refresh tokens.
- **DevOps**: Updated environment configurations for Railway and Vercel, and streamlined the project's `package.json` scripts.

apps/frontend/src/components/integration-modal.tsx

@@ -19,13 +19,20 @@ export function IntegrationModal(props: IntegrationModalProps) {
     setTimeout(() => setCopiedSnippet(null), 2000);
   };
 
-  const hostedPageUrl = `https://bookra.eu/book/${props.tenantSlug}`;
+  const hostedPageUrl = props.publicBookingUrl;
+  const baseUrl = (() => {
+    try {
+      return new URL(props.publicBookingUrl).origin;
+    } catch {
+      return "https://bookra.eu";
+    }
+  })();
 
   const htmlWidgetCode = `<div id="bookra-widget"></div>
 <script>
   (function() {
     var script = document.createElement('script');
-    script.src = "https://bookra.eu/widget.js";
+    script.src = "${baseUrl}/widget.js";
     script.async = true;
     script.onload = function() {
       BookraWidget.init({
@@ -65,7 +72,7 @@ function App() {
 add_action('wp_footer', function() {
 ?>
 <div id="bookra-widget"></div>
-<script src="https://bookra.eu/widget.js" async></script>
+<script src="${baseUrl}/widget.js" async></script>
 <script>
   window.addEventListener('load', function() {
     BookraWidget.init({

apps/frontend/src/components/shell.tsx

@@ -76,6 +76,7 @@ export const Shell: ParentComponent = (props) => {
   const navigate = useNavigate();
   const [mobileMenuOpen, setMobileMenuOpen] = createSignal(false);
   const hideHeader = () => location.pathname.startsWith("/dashboard");
+  const hideFooter = () => location.pathname.startsWith("/dashboard");
   const [signInOpen, setSignInOpen] = createSignal(false);
   const [authMode, setAuthMode] = createSignal<"sign-in" | "register">("sign-in");
   const [name, setName] = createSignal("");
@@ -88,6 +89,7 @@ export const Shell: ParentComponent = (props) => {
   const showGoogleSignIn = () => auth.supportsGoogleSignIn() && authMode() === "sign-in";
 
   const navLinks = [
+    { href: "/pricing", label: i18n.t("nav.pricing") },
     { href: "/about", label: i18n.t("nav.about") },
     { href: "/contact", label: i18n.t("nav.contact") },
   ];
@@ -409,6 +411,7 @@ export const Shell: ParentComponent = (props) => {
 
       <main class="flex-1">{props.children}</main>
 
+      <Show when={!hideFooter()}>
       {/* Footer */}
       <footer class="border-t border-border/60 py-16 bg-canvas-subtle/40">
         <div class="section-container">
@@ -480,6 +483,7 @@ export const Shell: ParentComponent = (props) => {
           </div>
         </div>
       </footer>
+      </Show>
 
       <Dialog open={signInOpen()} onClose={() => setSignInOpen(false)}>
         <DialogHeader>

apps/frontend/src/components/widget-builder.tsx

@@ -215,6 +215,7 @@ export function WidgetBuilder(props: WidgetBuilderProps) {
   const [selectedSize, setSelectedSize] = createSignal<WidgetSize>("default");
   const [selectedPosition, setSelectedPosition] = createSignal<WidgetPosition>("bottom-right");
   const [copiedSnippet, setCopiedSnippet] = createSignal<string | null>(null);
+  const [copyError, setCopyError] = createSignal<string | null>(null);
   const [showPreview, setShowPreview] = createSignal(true);
   const [draggedIndex, setDraggedIndex] = createSignal<number | null>(null);
   const [customColor, setCustomColor] = createSignal(props.config.primaryColor || "#a65c3e");
@@ -1077,9 +1078,11 @@ export class BookraWidgetComponent implements OnInit {
     try {
       await navigator.clipboard.writeText(text);
       setCopiedSnippet(snippetId);
+      setCopyError(null);
       setTimeout(() => setCopiedSnippet(null), 2000);
     } catch (err) {
-      console.error("Failed to copy:", err);
+      setCopyError(i18n.locale() === 'cs' ? 'Kopírování se nezdařilo. Zkuste to znovu.' : 'Copy failed. Please try again.');
+      setTimeout(() => setCopyError(null), 3000);
     }
   };
 
@@ -1445,6 +1448,11 @@ export class BookraWidgetComponent implements OnInit {
           </div>
         </CardHeader>
         <CardContent>
+          <Show when={copyError()}>
+            <div class="mb-4 p-3 rounded-xl bg-[hsl(var(--error-soft))] border border-[hsl(var(--error))/20] text-[hsl(var(--error))] text-sm font-medium animate-fade-in">
+              {copyError()}
+            </div>
+          </Show>
           <Tabs defaultValue="html">
             <TabsList class="mb-4 flex-wrap">
               <TabsTrigger value="html">HTML</TabsTrigger>